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Published online 1999 May 18. doi: 10.1186/cc341

Figure 2

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Red (R) and infrared (IR) scaled alternating current (AC) signals at arterial oxygen saturation (SaO2) of 0%, 85% and 100%. The numeric value of the red-to-infrared (R/IR) ratio can be easily converted to SaO2. Published with permission [10].

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